Chapter 2 Operating Your Universal Counter
Using CHANNEL 1 and CHANNEL 2 Input Conditioning Keys
Operating Guide 2-47
2
Signal will not generate a count because the trigger level is set below
the midpoint of the signal, causing the lower hysteresis level to not be
crossed.
The sensitivity specification is given in terms of volts rms for applications
that involve measuring a sine wave signal, though it should be noted that
a different waveform with the same rms voltage may not trigger a count.
Since the Counter input does not respond to the rms value of the
waveform but only to the peak-to-peak value, the sensitivity specification
is also given for volts peak-to-peak with a minimum pulse width.
As previously mentioned, the sensitivity of the Counter can be changed by
using the SENSTVTY: MED, HI, or LOW menu choices in the
Trigger/Sensitivity key menu for optimum sensitivity for certain
measurement applications. For example, low sensitivity setting is very
useful when measuring noisy signals.
Upper
Hysteresis
Level
Peak-to-Peak
Sensitivity
Trigger
Level
Lower
Hysteresis
Level
Input signal
to Counter
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